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7-74-04; 17:40 ;Lester Bulldln� ;3203955376 # 11/ 28 <br /> Article Request Page Page 9 of 26 <br /> to footing removal. <br /> Each footing was prepared for coring by scraping off sand and removing the metal screening form. <br /> A minimum of four 7.0 cm(2.75 in.)diameter cores were drilled from each of the 18 footings <br /> removed at the 4 week mark.Only thtee cores were cut&om each of the footings removed at the 12 <br /> and 24 week marks.Surfa.ce moisture was blotted off the cores with paper toweling.Cores were <br /> th�n air-dried for a few minutes and then capped in accordance with ASTM C617-98.Capped core <br /> diameter and height were recorded,and the cores were loaded to failure in compression in <br /> accordance with ASTM C39/C39M-01.Elapsed time between coring and tesiing was 1 to 2 hours. <br /> Figure 7 contains photographs of the coring process,a typical cored footing,and a capped core. <br /> (a)(b)(c)Figure 7. (a)Nathan Ryan drilling cores. (b)Typical cored footing. (c)Capped core. <br /> Volumetric Moisture Content <br /> Volumetric moist�re content(VMC)is equal to the volume of water in a substance divided by the <br /> total volume of the substance.For soil,VMC can be calculated as: <br /> VMC=Mdb?d/7w[1J <br /> where:Mdb is�oil moisture content expressed on a dry basis;?d is soil dry bulk density;and 7 w <br /> is water density. <br /> Moisture contents of the sand samples removed from each tank were converted to volumetric <br /> moisture contents using a fixed value of 1826 kg/m3 (1141bm/ft3)for sand dry bulk density.Each <br /> of these VMC values was matched with the ECHO probe mV output value r�orded in the same <br /> tank at the same time and at the same depth at which the sand sample was removed Four sets of <br /> values were obtained for each pmbe(i.e.,one each at 0,4, 12 and 24 weeks),and these values were <br /> regressed to obtain a linear relationship between VMC and that probe's mV outpu�Using the <br /> resulting relationships,the plote in figures 8,9 and 10 were developed.These plots show the VMC <br /> at various depths in tanks 2,4 and 6,respectively,as continuously monitored during the 24 week <br /> period. <br /> http://asae.frymulti.com/request2.asp?JII�S&AII�14082&CID=1n�003&v=&i=&'I�1 6/4/2004 <br />